diff --git a/simple_language_plugin/src/main/gen/org/intellij/sdk/language/SimpleLexer.java b/simple_language_plugin/src/main/gen/org/intellij/sdk/language/SimpleLexer.java
index b20c23625..84e6d210f 100644
--- a/simple_language_plugin/src/main/gen/org/intellij/sdk/language/SimpleLexer.java
+++ b/simple_language_plugin/src/main/gen/org/intellij/sdk/language/SimpleLexer.java
@@ -1,5 +1,6 @@
 /* The following code was generated by JFlex 1.7.0 tweaked for IntelliJ platform */
 
+// Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.intellij.sdk.language;
 
 import com.intellij.lexer.FlexLexer;
diff --git a/simple_language_plugin/src/main/java/org/intellij/sdk/language/Simple.bnf b/simple_language_plugin/src/main/java/org/intellij/sdk/language/Simple.bnf
index d6dc75a4a..6b69e6f81 100644
--- a/simple_language_plugin/src/main/java/org/intellij/sdk/language/Simple.bnf
+++ b/simple_language_plugin/src/main/java/org/intellij/sdk/language/Simple.bnf
@@ -1,3 +1,4 @@
+// Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 {
   parserClass="org.intellij.sdk.language.parser.SimpleParser"
 
diff --git a/simple_language_plugin/src/main/java/org/intellij/sdk/language/Simple.flex b/simple_language_plugin/src/main/java/org/intellij/sdk/language/Simple.flex
index f306ff342..810ca2439 100644
--- a/simple_language_plugin/src/main/java/org/intellij/sdk/language/Simple.flex
+++ b/simple_language_plugin/src/main/java/org/intellij/sdk/language/Simple.flex
@@ -1,3 +1,4 @@
+// Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.intellij.sdk.language;
 
 import com.intellij.lexer.FlexLexer;